There are a lot of special symbols in the Linux shell, which we should pay special attention to when we write Shell script: On the one hand, we need to know the usage of these special symbols, these symbols can be used to achieve a multiplier effect;
These special symbols are listed roughly as follows:
Copy Code
. Therefore, the variables defined therein are used only for the instruction group itself. Let's look at an example.# cat Ftmp-01#!/bin/basha=fsh (A=INCG; echo-e "\ n $a \ n") echo $a #./ftmp-01incgfshIn addition to the above-mentioned instruction group, parentheses are used in the definition of the array variable, as well as in other occasions where the escape character may need to be used, such as an expression.(())This set of symbols is similar to
QQ Pinyin How to play a special symbol?
1, first, the input method to switch to QQ Pinyin input method. After the switch is good, you can see it in the lower right corner of the desktop. As shown in the following figure.
2, the simplest output special symbol is directly according to the expression to play pinyin, such as playing La La LA, there will be special symbols, as shown in the following figure.
3, sometimes, want oth
1, first, the input method to switch to QQ Pinyin input method. After the switch is good, you can see it in the lower right corner of the desktop. As shown in the following figure.
2, the simplest output special symbol is directly according to the expression to play pinyin, such as playing La La LA, there will be special symbols, as shown in the following figure.
3, sometimes, want other special
ArticleDirectory
Single symbol
Symbol combination
There are various summary and classification articles everywhere. Therefore, I will also take readers to summarize the symbols that appear in. net. I hope you can clarify the vague memories of some symbols and give some inspiration to you.
ProgramTake five seconds to move your eyes away from the screen and look at your keyboard (e.g. fig
Linux Special symbols===========================================================================================$ numberUsually represents the meaning of a variableecho $ variable name = variable Value= equals signThe general definition of variables is used whenFor example [[email protected] aaa]# ABC=/ETC/PASSWD[Email protected] aaa]# echo $ABC/etc/passwd^This symbol represents the "start" position of a row in a regular expressionFor example [[emai
To be able to use the keyboard to enter symbols that are not on the keyboard directly, users can do so by adding "autocorrect" entries to common symbols in Word2010. The steps for adding AutoCorrect entries to common symbols in Word2010 are as follows:
In step 1th, open the Word2010 document window and switch to the Insert Ribbon. Click the symbol button in the
1. > Redirect Output symbols. 2. >> redirect output symbols, but with append functionality. 3. 2> error redirects the output symbol, overwriting the original file contents. 4. 2>> error REDIRECT output symbol, has the function of file content append. 5. * matches any character. 6. ? matches any one character. 7. | pipe symbol. 8. Background Process character. 9. l logic and
Starting with a version of 2.6 of the Linux kernel, the kernel introduces a mechanism for exporting symbols. Only symbols exported using Export_symbol or EXPORT_SYMBOL_GPL in the kernel can be used directly in the kernel module. However, the kernel does not export all the symbols. For example, in the kernel of 3.8.0, Do_page_fault is not exported.And I need to us
on the special characters of LinuxWe often follow the special symbols on the keyboard such as (?,! , ~...) dealings, in fact, in Linux has its unique meaning, can be broadly divided into three categories: Linux special symbols, wildcard characters, regular expressions.Linux Special symbols can be divided into the following categories1. pipe Symbol
When you use Word for word processing, you often have to enter many symbols. Here are some common ways to enter special symbols for other languages.
1. Insert Symbol method
Click the Insert menu bar, select the symbol command, in which you can choose Latin, Greek, and other languages, such as Figure 1.2.38-1.
But this method calls the symbol module time to be longer, plus in the larger space looks for ne
First, insert special characters
1. Place the insertion point where you want to insert the symbol.
2. Perform insert → symbol, open the Symbol dialog box, and switch to the special Characters tab. There are special symbols listed in the character list box, such as long dashes, dashes, copyright characters, registers, and so on.
3. Select a character to use (as an example of the "copyright" character) and click the Insert button to insert it into th
play something now! First, use the wildcard character with the LS file name to see:[[email protected] ~]# lang=c In addition to wildcards, what are the special symbols in the bash environment? We'll take a look at the bottom:
Symbol
Content
#
notation: This is most commonly used in script, as a description! None of the data is running after
\
Skip symbol: Revert a "special characte
.
Next use the wildcard character with LS to find the file name to see:
Example one: Find the file name that starts with cron under/etc/ ll-d/etc/cron* Example two: Find the file name "exactly five letters" under/etc/ example three: Find out the file name of the/etc/under the filename contains the number of the file name example four: Find out the/etc/, the file name starts with a non-lowercase file name: Example Five: Copy the files found in sample four to/tmp CP-A
How to insert unusual symbols in a Word document
Method 1
Open the Word document, and then click Insert--"symbols"--"other symbols."
2, in the pop-up dialog box, select the appropriate "font", "subset", you can get some special characters.
3, in the pop-up dialog box, select "Special characters", you can get "co
Tags: ar using sp div on code amp AD EFThe wildcard characters for Oracle, operators are typically present in the WHERE Condition clause:
Operator:
equals: =,
Contains: In, not in, exists, not exists
Range: Between...and, not Between....and
Match test: like, not like
NULL test: Is NULL, is not NULL
Boolean links: And, or, not
Wildcard characters:
In the WHERE clause, wildcards can be used with a like condition. In Oracle:
Perce
must be a character, as long as it is not, other characters of B and c are accepted.
Example: Find the file name starting with a non-lowercase letter under/etc:
[Root @ instructor Desktop] # ll-d/etc/[^ a-z] *
Ii. Summary of special symbols
Common special symbols in shell are listed as follows:
#;.,/\ 'String' |! $ {}$? $ * "String "***? : ^ $ # $ @ 'COMMAND '{} [] [[] () | {xx, yy, zz ,...}~ ~ + ~ - \
#
OpenCV has an orb feature and a GPU version of surf,
Reference: OpenCV on GPU version surf feature points and Orb feature points extraction and matching examples as to what parallel APIs are used for the time being not explored.
But no opencv-sift GPU was found to be used. Need to compile, reference: Compile OpenCV GPU, use cuda acceleration
Siftgpu's original library can be compiled through. However, it is not available and leads to a series of 96 compilation errors when used.
1.Glew function
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